Did your parents ever let your significant other go into your room as a teenager?

After over 8 months of being in a relationship with the same girl, my parents decided that it was fair to make a rule that she's not going to be allowed in my room again. They say it's because my twin sister (who's straight while I'm in a homosexual relationship) would never be allowed to have a boyfriend in her room. The thing is, that "boyfriend" is nonexistent. And the closest person to a boyfriend she has would never be allowed out of his house anyway. I agree that a double standard wouldn't be fair, but they should have thought about that a longggg time ago. At this point, it would only be fair if they simply let her "boyfriend that doesn't exist" in her room.
And why I feel like it's unfair to me is because you know what we do when we're in my room? We cuddle. Mostly cuddle. We nap, have tickle and pillow fights and the occasional makeout session. My door is ALWAYS open and my sister is usually right across the hallway! Because that is such a horrible situation for a responsible 16 year old girl to engage in.
And it's not like I could try and discuss it with them everything would be claimed to be backtalk. If I show a problem with it, then their logic is that we're obviously having sex up there 24/7 which proves that the rule should have been in place. But no, instead we're supposed to be content with sitting in our dining room twiddling our thumbs at each other. My girlfriend suggested that we awkwardly cuddle in our living room in front out my parents. She said, "If they take away out privacy, they'll have to deal with what we do in private." I agree, yet I still couldn't bring myself to do that.
And on top of that, she was supposed to come over tonight. She said earlier that she wanted to come home from her college orientation and cuddle in a warm bed while drinking tea.
Sorry for my rant, I'm just in a super pissy mood right now. Anyway, no need to lecture me on the whole "Their house, their rules" argument. I realize, but that doesn't mean that punishments should be handed out for no reason whatsoever.

So, did/do your parents allow your significant other in your room as a teen? And any suggestions on what I can do in my situation would be greatly appreciated.